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Comparative evaluation of abutment screw loosening with two different thread lockers under cyclic loading: An in
Lizy Teena Arul1, Vidyashree Nandini Venugopal, Russia Marimuthu
1Department of Prosthodontics and Implantology, SRM Kattankulathur Dental College and Hospital, Kattankulathur, Tamil Nadu, India.
Journal of Indian Prosthodontic Society
|January 1, 2026
Summary
Methacrylate threadlockers significantly enhance dental implant abutment screw retention compared to dimethacrylate and no threadlocker. Cyclic loading reduced retention, underscoring the need for improved prosthetic strategies.
Area of Science:
- Biomaterials Science
- Dental Implantology
- Prosthodontics
Background:
- Implant abutment screw loosening is a common complication in dental implantology.
- Effective retention of abutment screws is crucial for the long-term success of implant-supported prostheses.
- Threadlockers are utilized to enhance screw stability, but their comparative efficacy requires further investigation.
Purpose of the Study:
- To evaluate and compare the efficacy of different threadlockers in preventing dental implant abutment screw loosening.
- To assess the impact of static and dynamic loading conditions on screw retention.
- To determine the optimal threadlocker for improving abutment screw stability.
Main Methods:
- An in-vitro study involving 30 implant-abutment assemblies divided into three groups: control (no threadlocker), dimethacrylate, and methacrylate.
- Specimens were subjected to static torque and cyclic loading (240,000 cycles) simulating one year of clinical function.
- Detorque values were measured to quantify screw retention under static and dynamic conditions.
Main Results:
- Methacrylate threadlocker demonstrated the highest detorque values, indicating superior screw retention.
- Dimethacrylate threadlocker showed moderate retention, while the control group exhibited the lowest.
- Detorque values were significantly higher under static conditions compared to dynamic cyclic loading across all groups.
Conclusions:
- Methacrylate-based threadlockers significantly improve abutment screw retention in dental implants.
- Cyclic loading reduces screw retention, highlighting the need for advanced retention methods.
- Clinical application of methacrylate threadlockers may enhance the longevity and success of implant prostheses.
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